On the outside, both trucks retain a shape that's similar to the outgoing models. Many of the exterior changes were practical ones, aimed at reducing wind noise or improving drag to boost fuel economy. But cosmetic changes like a larger grille, taller headlights and blocky, squared-off fenders also give the trucks a brawnier look.

The really big changes are inside the full-size trucks. While the column shifter stays put, the interior gets some much-needed style thanks to new shapes and a full-color "driver information center" located in the gauge cluster. The Silverado and Sierra also boast new soft-touch materials throughout the cabin that give the interior a higher-quality feel. As in today's models, an 8-inch touchscreen is optional. But it now features GM's infotainment technology, dubbed MyLink in the Silverado and IntelliLink in the Sierra.

Under the hood, the big GM trucks get revised versions of their current powertrains. That means a 4.3-liter V6 engine is standard, while 5.3- and 6.2-liter V8 motors are optional. But thanks to newly standard direct injection, improved cylinder head design and cylinder deactivation, GM says the updated engines should all achieve better fuel economy than the old versions. It will also help that each engine will be mated to a 6-speed automatic transmission, replacing the 4-speed previously used in V6 models.

Of course, the new 2014 Chevrolet Silverado and GMC Sierra also gain a long list of new features. Passengers will especially appreciate new front-hinged rear doors on extended cab models. Once reserved solely for crew cab variants, the doors will make it easier to gracefully exter and exit the vehicle. The trucks also gain luxury car levels of optional safety equipment including a forward collision alert system and lane departure warning technology. They also offer GM's new "Driver Alert Seat," which vibrates seat bolsters to alert drivers to potential hazards like a vehicle approaching too quickly. And new technology includes up to five USB ports, four 12-volt outlets and one SD card slot.

According to GM, the full-size pickup twins go on sale in the second quarter of 2013. Pricing hasn't been announced, but we don't expect it to stray too far from today's figures.

What it means to you: GM's latest full-size trucks move the large pickup game forward. And now that they've been revealed, look for great deals on outgoing models.

With the Ford F-150 and RAM 1500 also recently revised, the full-size truck segment is heating up. Which one would you buy? Tell us in the comments below.

Doug DeMuro
has a wide range of automotive industry experience, from work at a Ferrari dealership to a manager for Porsche North America. A lifelong car enthusiast, Doug's eclectic vehicle purchases include a Porsche 911 Turbo, an E63 AMG wagon, an old Range Rover and a Mercedes Benz G-wagen.